Opp. Fire

[plloyd1010]

Playing Fall of France Scenario 15 with the moderator of this forum, a Pz-II unknowingly moved by road adjacent to a hidden French Somua unit in a field. The Somua took an opportunity AT shot at the Pz-II and threw an 11.
My question relates to the correct way to interpret the way that the column modifiers are calculated. The Somua's AT value is a 3 vs. the Pz-II's armor value of only 1, so the attacking unit gets a +2, so far. The opportunity fire requires a -1, so the net column modifier is a: +1, as interpreted by my opponent. However, perhaps because I am not as familiar with game mechanics as more seasoned players, I and other players have been adding a second -1 in similar situations involving AT opportunity fire at targets based on the "immediately preceding action segment," resulting by this interpretation, as a -2, rather than a single negative column shift. Using this example and interpretation, the attacking unit's throw should've been reduced by 2 columns, not one, and the modified die roll would have been a 9 for no effect.
This interpretation may be faulty, as this opportunity fire is occurring in the SAME action segment and not in the opposing player's "immediately preceding action segment" depending on the definition of "immediately proceeding." Although my opponent's interpretation, which ingnores the second negative column modifier sounds gamey and noncongruent to me -- this may in fact be the game designer's intent. If so, some clarity and a better definition of what "an immediately preceding action segment" is intended to mean -- should be provided in future editions of the rules regarding AT opportunity fire.

The argument is over this modifier during opportunity fire:
     -1: Target moved in the immediately preceding action segment

My position is that opportunity fire happens in the current action segment (that which the subject vehicle is moving in). The "preceding" action segment was when I took a shot at one of his tanks. Assuming I had missed the PzII with opportunity fire, and I took another shot at it in my activation, that is where "Target moved in the immediately preceding action segment" would apply. In shot one modifier applies in his activation (for opfire) and one applies in my next activation.

P.S. I'm also sure we went over this, long ago, in the 3rd edition rules.